Why can Uri work at the hotel and not be discovered as a Jew?

Uri uses a different name at the hotel.

He shook me. “Never mind what I’m doing here. I work in the laundry. If I see you in here again, I’ll tell them to shoot you. My name is not Uri here. You never, never call me that.” His hand squeezed my neck. His breath was in my face. “Do you hear?”